Process of treating ores.



JAMES OTIS HANDY, OE PlTTSBUBG, PENNSYLVANIA.

noor-zss oF T REATlNG oses.-

Ira-821,63 7.

To cll whom, it may concern.-

Be it known that I Jmns Orrs Humor, a citizen of the United Penns lvama,-have invented certain new and useful provements in Proeesses of Treating -()res; and I do hereby declare the following to 'bea full, clear, and exact description of the set forth in th .Q'PP

ther, 45

cobalt, nickel, arsenic, 8:0.

inventiiin, such as will enable others skilled. inthe-art to which it appertains to make and 'use the same.

This inventionrelates to processes of treating ores; and it consists in a method of treating certain arseniferous ores fortheextraction of cobalt and nickel and other valuable constituents, all as -more fully hereinafter set forth, matters of novelty being particularly ended There are certain arsenical ores oi the en- 'eral natur of those now mined in the co alt campof the- Nipissi 'trict which have hit "(Outer-i0) mining diserto resisted eiforts to extract all the contained values by shoe and effectual methods. The ores from cob t, for example, consist mainlyof arsenids, arsenates,

'arsemtes, antimonids, &c., of cobalt, nickel,

iron &c:, in a calciteg e and considfez-able silver, either in t e native state or in combination. Heretofore no satisfactozfi "method has been evolved for rec'overing these values, even by the buyers who haveurchased large uantities of these ores, d be worked. Recovery lie -,the co ohthe silver in the lead-smelter is of course practicable; but this sacrifices nearly all the In smelting such e speiss may.be formed;

ores some low-grad -.but most of the cobalt, -&c., is lost. Even roasting of these ores has not proved .practi. cable, for the reason that silver oes over with e losses from this cause in some experiments have amount-.

the fumes of arsenic, &c., and

ed to as -much as twenty-five per cent. Furin none of these prior methods have the cobalt and nickel been roduced. in easilyavailable fonnsseparated m the other constituents of the ore. Neither have the cobalt and nickel been separated from each ether.

It is the object of the resent invention to treat such ores by a simp e, ready, and cheap method for the recovery of practically all the e ore in easilyspeciilcationof LettersPatent. Application on February all, 1906; Burial s. 802.784.

available form, doing this 15 tates, residing in Pitts--. burg,. county of Allegheny, and State of;

considered advisable is several hours. The bases I ?atented 1!ay22), recs.

succession of steps, each re'su to deliver the nickel and cobalt in'comme'rcrush and powder the ore toa out .ei 11 mesh size. Much of the contained gol sd 1 cial forms. For this purpose-=1 reliminarily ver, &c., will refuse to pass throaziph sieves of this mesh, a residue pf metice being often obtained which rupsas high as fifty to eighty per cent. of silver.- This'r'esiduc may be treated in any of .thS usualways, as by smelting, or sold direct, or the. silver and gold may be dissolved by azlzlppropriate solvent, and preci itated by met ic iron or other reagent and added to the silver and gold obtained in later operations.

In the sifted are it is often advisable to concentrate the valuable minerals to economize reagents later on. This mayin some cases be done bygelutriatioh or other mechanical treatment ut in others, as with the ores from cobalt, the calcite is oftentoov int mately 8d:- mixed to ermit such mechanical separation.

Someof t ese ores, even when high grade, con-' to thirty. per cent.

tain as much as twenty calcite. In such instances it may be lQ-i an organized tm in the.for.-- mation-of a valuable product, an; the several steps of the method as a whole cooperating moved by solution with acid or in other wellunderstood walys. acid is suitab e, which are much may concentrated by a preliminary furnac of the lump ore with or without fluxes like 'ca or limestone; to form a speiss before further treatments. A manner of such .a poses o my method such treatedexactly like the ore, unconcentratcd.

The ore, freed from metallics and concentrated in any of the ways described, if this be next decomposed by an acid medium. F or this purpose .concen trated-sulfuric'acid is suitab e. class described may be-completel decomposed and oxidized by hes. trate sulfuric acid to. 400

or the valuable mlherals,

speisses may be concentrated or verted into sulfates and the arsenic to arsenious 01nd,-

partlg. vo atilizes and'partly goes into SOIIDSWRI. to e Veryhot dilute sulfuric like speiss in..their nature,i

i e iss is later described. For the pur-' Ores of the wit concenahrenheit' 'for present are 'con- 'dize'd separated a rcverb eratory,

crtiou may be afterward. The volst-ilized g ,liambeis" tures. This also shortens the time necessary. For purpose the sulfuric sold may have added to it an mike-line sulfate in greater or less amount, thercbv forming said sulfates capable oi' withstanding comparatively high temper-ch mes, or, and ve-r advanta eously, acid suliates may be use direct. pro-5e1- the sodium salt, since potassium bisulfste and the normal suli'utc formed from it on heating are relatively less soluble, embar ra-ssing the leaching operations further on. The potass'um salt has the additional disad; Tantage of forming difficultly-solublc doub e salts with nickel grid cobalt sulfates and of forming alums, also difiicultly soluble. For these reasons I prefer the sodium bisulfcte 'to the corresponding potassium salt; but the latter may be used in some cases. Sodium bis-u *ate may very advent-a5, "nsly contain about forty per cent. of a? ileble suburic acid. "Niter cake is a cheap and convenient commercial form of bisulfcte.

When the sodium sulfate i= used, either as bisuliatc or as an addition to acid, it may be recovered in the later steps of the process, and the process thereby cheapened materially.

Using the bisul'rate or sodium the powdered ore is thoroughly mixed with the 36%- ered flux. Ordinarily I refer to use u out three "parts of the bisuhstcto one of ore. The mixture is next fused, preferably, in two stages. be applied The necessary heat in any convenient way and in. any, convenlentapparatus, e ther throngs :1- containing vessel or by reflected-or radiated neat, es in a. During the first stage some b f b trothmg 1:81:65 place, this ting less 1 t .e

- hectbo subplied from above-or from the sulfate.

condensing sides, and a-iso less if the mixture is dry and not too high in calcite ganglia.

The heat applied in the first stage should be enough to Insure. fusion and the-expulsion 01" carbon dioxid, water, and some or most of the excess of sulhuic acid. In the second used, and the mass usually becomes colored from the format-i021 of colored sulfates, frequentlv becoming pink from the presiice of coba t in this stage of hosting; sulfur clioxizl and arscnious cxid vapor-3 are evolved. The arscnious acid is led off to any suitable apparatus, such as the usual poisou-chsmnors, and there condensed, forming s. valuable my-product. The underlying ideain his treatment, either with the sulfuric acid or with-the bisulfate, is to .oxidiz in the 6 5 nresence of on acid medium capable of combining with the bases. Part of the sulfur trioxid of the acid or bisulfatc is redhcecl by the unoxidi'zed bodies present in the ore, suliur dioxid escaping and the rest of the sulfur trioxid combines with the basic oxids to form sulfates. Using the bisulfate these sulfates are finned and dissolved by the sodium sulfate. The arsenious oxid is the only one of the oxids formed which has no affinity' for acids. and as it is volatile it is driven hfi, as described. The silver is largely converted into sulfate and does not tend to escape with the arsenic, as in the ordinary roasting processes, hercinbefore referred to.

Natur clly sziymixture of salts or other reagent-s which will exercise at once the functions of an oxidant and of an acid-fluxing agent may be employed- For instance, borax, silicates, silica, or other bodies cspable of actmg as acids athigh temperatures may be admixed with a mtrstc, such as thenitrate of potassium or sodium, and the ore, or

a. mixture of acid flux and'orc may have the oxidant added portionwise. The point is to oxidize and retain the bases by an acid bodycapable of withstanding relatively high toms peratures, while at the some time oxidizing and expelling the arsenic.

Using the stated acid fluxes, b very care- 5 Iul treatment the oxidant may c re laced by air, the various basic oxids forme combming with the acid flux while the arsenic is expelled. 1V ithout such careful treatment a. s .eiss of arsenic and other metatl's is very likely to be formed. This I may make designedly as useful as an accessory reagent in the mom process for purposeslater appearin The lump or powdered ore may be fused soda ash and silica, some of the soda. being replcceeble by lime whei the ore happens to be poor in that substancu. For" example, two parts of oremay be sed with one part of soda. ash and one part of silica, giving a clean sla and a speiss containi arsenic combined wit silver, cobalt, and nic l; but, as stated, I or breaking up'the ore the sodium bisulf is cheap, convenient, and readily recoverable,

and it is furthcrcdvanta eous as obvicting the necessit of an acid wiring the melt into solution when the hereinafter described method is to be applied for regaining the other bodies from the same. For such a.n :ipplica ticn when borax, silicates, and similar acid fluxes have been emplbycd ordinarily an acid such as hydrochloric or sulfuric must be used to bring the melt into solution.

Using sulfuric acid or the bisulfste in the manner described, all the basic oxids are converted into stable sulfates, and though some or all of the iron may be =:thel converted ferric sulfa. be and broken up into oxid by raising the temper-ctr ordiusr l prefer to lead,-bari'um,

- of cobalt, &c., being tionczi, which rep moved from the residue of insol bis sulfates ma leave some or all of it'as fenous'sulfate for reasons later appearin'ii When the melt is oroughly sulfatediiri :either of the ways described, it is allowed to cool and extracted with water.

When the bisuli'ate has been used, it-is.advantageous to .use' a small portion of hot water for the extraction, since when the solution is allowed to cool much ofthe sodimn sulfate formed in the fusion will be found to crystalline out, being thereby re ained for use, and the solution will bepurer %or subsequent mani -ulation. nder the influence of the hot water the soluble sulfates-such as those of silver,'cohalt, nickel, manganese, iron, sodium, &c.- are dissolved, leaving-a residue of insoluble sulfate of calcium, silica, silicates, &c. If and strontium be present, their in this residue.

su'li'ates will 'also .be found Silver sulfate, however, :while ioi into solution is,again quickly reduced yt. e reduci' bodies resentsuch as ferrous sulfate, s tee, an arsenious ,0Ild- 'fl.nd the' silver formed goes into the residue. -If an insuifi cie'nt amount of these reducing bodies is found in the-melt and silver remains in solution, it can bezremoved in a number of we s. Me- .tafigciliron will reduceit and ma e used. More ferrous sulfate may be adde to mentthat alreadyin the melt. Another conveni'ent method is to add a little of the original ore. The contained smaltite and other cob alt minerals will readily precipitate silver from' the-solution, a corresponding amount dissolved. By this proccdure it is obvious a portion of the ore may be directly treated without the necessity of.

sulfatinigfin The reaction between silver sulfate an sly-ground arsenid' of cobalt, &c., is yery rapid, even below the boilhzg-pomt of the sulfate solution- The speiss b ore menresents a concentrated arsenid may-also be used for this precipitation. 'lihe precipitation of the disso ved silver by an 0! the methods stated may be performed cit eri'betorc or-after the leacm' -water is rezi ble sulfates.

In the former case the precipitated silver minfies in the prccip'tate with the insoluble sillates.

- As the sulfates -&c., inthe undissolved -residue are much lig tcr than silver, this residue separating from the solution of the solube concentrated as regards the silver by e utriation or stirring up with water, or the silvermay be directly recovered from the residue.

The silver-freed lixiviate from the melt contains sulfates of sodium, lime, magnesium iron, cobalt, nickel, manganese, &c., as well as some residual arsenic or arsenious acid.

Where treatment of the ore has beenwith sill- Furic acid. the amount of this arsenious oxid being efta litt eon the acid side.

supple- .ma ration of the nicliel and'cobalt. 4 The h ootassium errimay be comparatively la ge; In the case of t e bisulfate-treatment t ere will be less, the .amount depending the i1 operation has been performed; but ordinarily there will not be cn'ou h to be of any commercial significance At t e same time it is necessary to remove it before proceeding to further operations. To remove this residual dissolved arsenic, the liquid is neutralized, referabl with ahttle milk of lime, Iron, arsemous acid, 'sulfites, &c.,'are then oxidized by the careful addition of any oxidant.- Bleaching-powder (hypochlorite of lime) or other hypochlorite is convenient.- -Neu tralization with lime is resumed till a dark-brown preciplitate begins to form, when whiting or any 0t or commercial form of is added. The admixture is well stirred and the precipitation completed by the cautious addition of a little lime water. to combine with free carbon dioxid. By' this operationthe iron is completel precipitated, carrying down with it the resi ual arsenic left after the. fluxing, while the sulfates of cobalt and nickel The precipitate is so aratedv are unaffected. by filtration or decantation, and the 0 car liqmd is ready for further. treatment. For this ur ose the li uid is treated by the cautious? Eddie on of a solution of h ochlorite, preferably the sodium salt, thoug the calcium salt be used, for the precipitation and sepachlorite is added cyanidwhic h with coba.lt-in in the solution. The cobalt is as cobaltic oxid, while the nickel remains dissol'ved. separation of the cobalt precipitate by filtration or decanting the residu m the addition. of more ypochlorite. Since this hypochlon'te prcci itationis preferential, all the cobalt own before any 05 the.

nickel, the operator'may at pleasure obtaina as long as 'ves a re dish coloration purecobalt precipitate, free from nickel, by

using; the exact amountof hypochlorite required, or, and.more easily,zby etting a little cobalt remain in the solution-i. e.,by using a littleslcss .of the reagent than is necessary for the full amount of the cobalt, or he may obtain a cobalt-free-nickel solution by throwing down a little'nickel with the cobalt, practice I prefer this latter alternative, since thecoprecipitated nickel on'd can be y removed from the precipitate b treatment with a little hot solution of co The nickel' dissolves and is re equivalent amount of cobalt. or this purcarbonate of lime.

cates the presence of cobalt. precipitated ckel may be preci itated in its turuby alt sulfate. laced by an onthe .manncr in which pose a portion of thasolution freed of 11011 and arsenic in the manner described may be used. After treatment of the preci rtate with the cobalt-sulfate solution. this tter, now containing the nickel which was in the byiprecipitation with an onidizinn agent, or by-.the-addition of both base-an agent. Bromin. mayagent. Chlorinis also suitable. 2

Iii-lieu of directlyprecipitat'nwcohalt and nickel from the solution freed ii'om-arsenic and iron in the manner described 'urppsa s'a'd solution-freed fronrar-i suitable acetate-such as the potassium- -sb i dium, calcium, m

esium, or 8133101110111 cobalt andbnifikeil. into '0 en nizkel rill salt-to convertcome down cssulfids in a comparatively ure state, and these snlfids, after removing om the solution, may be-roasted to convert them .into sulfates, or otherwise brought-into solu-- tion and then r'eci itated by hypochlorite in'the manner escri ed. In lieuof hydrogen sulfid'the, sulficl of potassium or sodium may be used; but a little acid should hepresent in such event to hevent the coprecipita- 1 mated with some manganese.

' ever, is removed in the treatmentwi t-h cobal t-' larly removed b 'After evap socalled tion of impurities. is best- Where the sulfid- Precipitation is not resorted to, but the so ution'frorn the iron-arsonic se aration is'directly preci'fitated with hypoc orite, the cobalt .iS usual contamihow ewhite or rhono sulfid sulfate solution- Manganese also up ears in the later nickel precipitate, but can e simitreatment with nickel sultats.

After removal of the nickel and cobalt, either b sulfid or hypochlorite treatment, the resi ual solution may be evaporated to recover the sodium sulfate therein contained.

oration the sodium sulfate crystallizes'out 1n the form of the hydrated salt, the Glauber's salt. It is preferable to expose the crystals to air until nearly dehydrated rather than to directly dry them,

since they have a tendency to fuse in their waterof crystallization and bake in the bottom of containing vessels when dried by urtificia-l heat. After partial dehydration in the air, however, hey mm" be safely finished by artificial heat. The,( ry or nearly dry saltmay be added to the sulfuric acid in the rimnner described, or it may be converted into hisulfate in adding the proper amount oi suluric aiili andheeting. This recovery of 54'..- dium sul etc effects a marked economy in the process.

be used as oicidizingl -,at this these bases, may he .preliminaril'y;- removed: as -sulfids. =Forthis i-recover all the valuable constituents in mass. sonic on ma 1s t18ai/Bd'IW1l7h'-.8D0ugh or any.

-co'vered.in the fusion with fluxes.

.theclass describedto about eightv-mesh-fine .-ness, sifting out the metallics treatment, sulfating or otherwise oxid zing,-

' -In-using ferrous suiate toprecipitatediw-Gg solved silver it is advantageous toedd ltd-111'"; ing the last part of ,the extraction with wa- 'ter to prevent useless oxidationby aha". Feerous sulfate for this pur ose-has=the adsan; 'tege over metallic iron that itd oesnottend to recipit-ate arsenic with the silver,-

t is advantageous to use boiling water in.-: extract ng .the suliated ore, sincev sils'er res.- ductiongoes-onhetter at this temperature and, as stated, less water need be-usedrwithi advantage in the recovery of sodiumsulfate:

point. "By-the described qarocess of =treetin' pres ofthe class d'escrihed it will be observesthat kstabls form. The-silver appears -partly in the metallics and only in thcred-ucsd rnetali.

aftersulfating; ere the ore contains old; as is the casein-certain ores of-thisjtype m Ore ou,.it is recovered with thesili'rer in-the resi ue aftersulfating. The arsenic is. re-- The co bolt and nickel are separated fromtheothez and less valuable bases and from-leech other. in the form of oxide directly merchanteble; The, -process as -a whole com rises=-a-.direet. series, of'steps tending tower the recovery of cobalt and nickel;

-To recapitulate, my process in the preferred form' consists in pulverizing an ore'of or separato and acidifying to expel vand recover arsenic, dissolving and reducmg and separating silver nlnd'gold, recipitating iron and residual arsenic-toget er, and then fractionally separating and-recovering cobalt and nickel by ref-J erential precipitation. I prefer as a 9.0-- tionating, agenta hypochlorite rather-thanthe other reagents described, since it gives a cobaltic oxid easy to wash and handle; but chlorin or bromin in the-presence of an alkae line carbonate or the carbonate of an alkalinecart-h, such as chalk, may-also be used.

In sulfating either \x ith sulfuric acid (Jr-the. bisulfate, some econoni of rea entlmaybe attained by using a litt e less t an is necessary to decom ose the cobalt minerels.-. The. undecompose residue will be broken up by the silver sulfate in leachin hat 1 claim. is-- 1. In the treatment of arseniferous cobalt and'nickel ores containing silver, the process which'consist-s in pdwd'ermg and sifting the ore to separate metallics, sulfating the fine ore, reducing and recovering the silver,-removing iron and arsenic to ethe-r, and separating and recovering cobalt and nickel;

:2. In the treatment of arseniferous cobalt and nickel ores containing siiver, the-procese which consists in suliatingthe ore,--reduei-ng and recoveringthe silver, removing iron ante and nickel ores conta and nickel 'ores cont 5S consists in nickel by arsenic to ether, and s ering'cob t and nickel 3. In the-treatment of arseniferous cobalt. and niche area containing. silver, the process 5 whichfconsists in sulfa'ting and recoveringthe silver with a fresh portion of theore, removing iron and arsenic to ether and parating and recovering coba tfancl nickel: i

14. In the treatmntof arseniferous cobalt ores,' the'process of reducing silver-and dissolving co'balt which consists in treatmga solution of sulfate of silver with an arsemd ore, of cobalt. I

5. In the treatment of arseniferous cobalt .and nickel area containing silver, the process -=whicl1" consists in bid the ore in the presence-of amoltenpcid' ux to 'expel and recover arsemc,'bring1ng the soluble matters go of-- the melt into solution and reducing and recovering the silver, removing iron andlre sidual arsenic t'o ether fromthe solution, and preci itating co alt and-nickel. '6. lnthe treatment of arseniferous cobalt 'ng silv'er, the process -w hich consists in. oxi the ore in the presencetof a. molten acid ux-to exp'el and recover arsenic, bringing the soluble matters 'of the melt into solution and reducing and iron' and re- 0 recovering the silver, .remo

solution, and t and nickel by fractional operating and recovsidual arsenic together from the separa cob p'reci ita'non. Y 7. the'treatment of arseniferous cobalt '33 nickel ores containing silver, the process w ch .in oxidizing the ore in the presence of agnolten acid uxto expel and recover arsenic, the'solublemtters --of thg melt solution and-reducing and so -r ecovefing the= iron and're- Y sidualarsenic to other from the solution, and "cobaltand nickel .by fractional reel 'tat1on',.with hypochlonte -i'8.-&li' the treatment-of amemferous cobalt -;3fidhi0kel ores contaminglsilver, the process 4 fiYhich-consists in fusing t e ore with sodium biBulfa-te toexpel and-recover arsenic, b

ing the soluble matters of the melt mto solu- 'tion and reducing and-recovering the silver, sgrremoving-iron and residual arsenic together ".-.'from the solution, and precipitating cobalt andnickel'therefrom.

' 9. In the treatment of ars'eniferous cobalt silver, the process e ore with expel and recover arsenic,br mgmg the soluble matters of the melt into solu- -.t1on and reducing and recovering the silver, removlng iron and residual arsenic etherfrom the solution,; and separating .cob t-and fractional -precipitation. A 10.111 the treatment of arseniferous cobelt and; nickel ores conta' silver,

' silver, renfro lsulfate to the ore, reducing bringing the soluble matters of the melt into solution and reducing and recovering the silver, and'separating cobalt and nickel by fractional recipitation-with hypochlorite.

11. n the treatment of arseniferous cobalt ores, the process which consists in fusing the ore with sodium bisulfate to expel and recover arsenic.

12. In the treatment of arseniferousores containin silver, the process which consists llnfusin'g t e ore with sodium bisulfate to expel and recover arsenic, bringing the soluble matters of the melt into solution, and reducing and'recovering the silver.

13. In the. treatment of arseniferous oobelt .'and nickel ores containing, silver, the process which consists in fusing the ore with sodium bisuliate to expel and recover arsenic, bringing-the soluble matters of the melt into solution, and preci itating dissolved silver by a fresh ortlon of ore.

14. In t e treatment of arseniferous cobelt and nickel ores containing silver, the process which consists in fusing the same with an acid flux to expel-and recover arsenic," bringing the soluble matters of the melt into solution and reducing and recovering the silver. i.

15.=' 'Inthe treatment of arseniferous cobalt and nickel ores containing silver, the process which consists in fusing the ore with sodium bisulfate to expel and recover arsenic, b ing the soluble matters of the melt into solution and reducing and recovering 'the sil-. ver .removing on and. residual arsenic to-. gather from the solution, precipitating coalt and nickel therefrom and evaporating and crystallizing to recover sodium sulfate for reuse.

16. The process of extracting cobalt from :05 ,nrseniferous cobalt and nickel ores contammg silver which consists in oxid' the same in the presence of a molten acil i flux, le the melt and reducing the same to precipitate silver, removing iron and residual arsenic together from the solution, preciEL cobalt to ether with a little mck'el ythe dition of htl more of an oxidi agent than correspon to the cobalt present, and treat the precipitate with a fresh portion of a il e balt solution to dissolve out the nickel therehom. A

17. The process of extracting cobalt from arseniferous cobaicand nickel ores contammg silver. which consists in fusing thesame with sodium bisulfa'te, leaching the. melt and reducing the same .to recipitate silver, remo iron and resi ual arsenic to ether prcisitating cobalt by the addition ofshgh y more hypochlonte solution than cor- I 5 spends to the cobalt present, and treat the precipitate with a fresh portion of the iron and arsenic-free solution to dissolve out the process consists in fuel the ore with 1 5; sodium bgeullfate and l' e cover arsenic,

nickel.

' 8. In the treatment of arseniferous cobalt 3 and nickel ores containing silver, the procsss which consists. in grinding and sxfting the same to eighty-mesh fineness to separate metallics, fusing the sifted ore with sodium bisulfate to ex el and recover arsenic, dissolving the me a and reducing dissolved silver with a. fresh portion of ore, removing iron and residual arsenic together from the solution, removing cobalt and. nickel by fractional QOIIBCUOUS in LSHPIFS Faient NO- UZLOUI.

sagas? qsrms'o'rls Witnesses: Fosrxnifi'gws rr, G20. H. CEA'rr.

Ibis hereby csriilisrl that in Lotters'latenfi No. 821,637, granted Kay 29, 1906, upo 'the applioation of Jazoes Otis Handy, of 1 ittsburg; Iennsylirania, for an improvoment in Erooesses of Treating Ores, errors appear requiring correotion, ss follows Lines and 24, pogo I, the words cobalt? should red fiobnlgond the 112.1215 of; tho second witness to'the printe lspecificat ion, for k Geo. H. eattfle 1 Gem-1 115.711. 2 9} and that the said Letters Batons shouk l be rad with iahene corrections thorifi that tire same may conform to the record of the in the Pa ;e;1t Qfie.

- Signed and sealed ibis 26th day of Jane, A. 1)., 19Q6.

E. B. MQQ E, Acting C'ommsjesidrwr of and rscov and nickel ores containing silver, the procsss which consists. in grinding and sxfting the same to eighty-mesh fineness to separate metallics, fusing the sifted ore with sodium bisulfate to ex el and recover arsenic, dissolving the me a and reducing dissolved silver with a. fresh portion of ore, removing iron and residual arsenic together from the solution, removing cobalt and. nickel by fractional QOIIBCUOUS in LSHPIFS Faient NO- UZLOUI.

sagas? qsrms'o'rls Witnesses: Fosrxnifi'gws rr, G20. H. CEA'rr.

Ibis hereby csriilisrl that in Lotters'latenfi No. 821,637, granted Kay 29, 1906, upo 'the applioation of Jazoes Otis Handy, of 1 ittsburg; Iennsylirania, for an improvoment in Erooesses of Treating Ores, errors appear requiring correotion, ss follows Lines and 24, pogo I, the words cobalt? should red fiobnlgond the 112.1215 of; tho second witness to'the printe lspecificat ion, for k Geo. H. eattfle 1 Gem-1 115.711. 2 9} and that the said Letters Batons shouk l be rad with iahene corrections thorifi that tire same may conform to the record of the in the Pa ;e;1t Qfie.

- Signed and sealed ibis 26th day of Jane, A. 1)., 19Q6.

E. B. MQQ E, Acting C'ommsjesidrwr of and rscov ment in Processes of Tlreating Ores,

It is hereby C'QIKLQUQ was All Letters Patent No. 821,637, granted May 29, 1906, upon the application of James Otis B andy, of Pittsburg, Pennsylvania, for an improveerrors appear requiring correction, as follows; Lines 20 end 24, page 1, the words oobalt" should read Cobalt, and the name of the Clapp; and that the said Letters Petent should be read with these corrections therein that second witness to the printed specification, for Geo. H. Ceattfl read Geo. H.

the same may conform to the record of he ease in the Patept Oifice. Signed and sealed this 26th day of June, A. D., 1906.

[SEAL] 5 E. B. MOORE,

Acting Commissioner of Patents. 

